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Commit 0be7320a authored by Catalin Marinas's avatar Catalin Marinas
Browse files

arm64: Assembly macros and definitions 



This patch introduces several assembly macros and definitions used in
the .S files across arch/arm64/ like IRQ disabling/enabling, together
with asm-offsets.c.

Signed-off-by: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
Acked-by: default avatarNicolas Pitre <nico@linaro.org>
Acked-by: default avatarOlof Johansson <olof@lixom.net>
Acked-by: default avatarSantosh Shilimkar <santosh.shilimkar@ti.com>
parent 048fa2df

arch/arm64/include/asm/asm-offsets.h

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#include <generated/asm-offsets.h>

arch/arm64/include/asm/assembler.h

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/*

 * Based on arch/arm/include/asm/assembler.h

 *

 * Copyright (C) 1996-2000 Russell King

 * Copyright (C) 2012 ARM Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

#ifndef __ASSEMBLY__

#error "Only include this from assembly code"

#endif



#include <asm/ptrace.h>



/*

 * Stack pushing/popping (register pairs only). Equivalent to store decrement

 * before, load increment after.

 */

	.macro	push, xreg1, xreg2

	stp	\xreg1, \xreg2, [sp, #-16]!

	.endm



	.macro	pop, xreg1, xreg2

	ldp	\xreg1, \xreg2, [sp], #16

	.endm



/*

 * Enable and disable interrupts.

 */

	.macro	disable_irq

	msr	daifset, #2

	.endm



	.macro	enable_irq

	msr	daifclr, #2

	.endm



/*

 * Save/disable and restore interrupts.

 */

	.macro	save_and_disable_irqs, olddaif

	mrs	\olddaif, daif

	disable_irq

	.endm



	.macro	restore_irqs, olddaif

	msr	daif, \olddaif

	.endm



/*

 * Enable and disable debug exceptions.

 */

	.macro	disable_dbg

	msr	daifset, #8

	.endm



	.macro	enable_dbg

	msr	daifclr, #8

	.endm



	.macro	disable_step, tmp

	mrs	\tmp, mdscr_el1

	bic	\tmp, \tmp, #1

	msr	mdscr_el1, \tmp

	.endm



	.macro	enable_step, tmp

	mrs	\tmp, mdscr_el1

	orr	\tmp, \tmp, #1

	msr	mdscr_el1, \tmp

	.endm



	.macro	enable_dbg_if_not_stepping, tmp

	mrs	\tmp, mdscr_el1

	tbnz	\tmp, #1, 9990f

	enable_dbg

9990:

	.endm



/*

 * SMP data memory barrier

 */

	.macro	smp_dmb, opt

#ifdef CONFIG_SMP

	dmb	\opt

#endif

	.endm



#define USER(l, x...)				\

9999:	x;					\

	.section __ex_table,"a";		\

	.align	3;				\

	.quad	9999b,l;			\

	.previous



/*

 * Register aliases.

 */

lr	.req	x30		// link register

arch/arm64/kernel/asm-offsets.c

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/*

 * Based on arch/arm/kernel/asm-offsets.c

 *

 * Copyright (C) 1995-2003 Russell King

 *               2001-2002 Keith Owens

 * Copyright (C) 2012 ARM Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <linux/sched.h>

#include <linux/mm.h>

#include <linux/dma-mapping.h>

#include <asm/thread_info.h>

#include <asm/memory.h>

#include <asm/cputable.h>

#include <asm/vdso_datapage.h>

#include <linux/kbuild.h>



int main(void)

{

  DEFINE(TSK_ACTIVE_MM,		offsetof(struct task_struct, active_mm));

  BLANK();

  DEFINE(TI_FLAGS,		offsetof(struct thread_info, flags));

  DEFINE(TI_PREEMPT,		offsetof(struct thread_info, preempt_count));

  DEFINE(TI_ADDR_LIMIT,		offsetof(struct thread_info, addr_limit));

  DEFINE(TI_TASK,		offsetof(struct thread_info, task));

  DEFINE(TI_EXEC_DOMAIN,	offsetof(struct thread_info, exec_domain));

  DEFINE(TI_CPU,		offsetof(struct thread_info, cpu));

  BLANK();

  DEFINE(THREAD_CPU_CONTEXT,	offsetof(struct task_struct, thread.cpu_context));

  BLANK();

  DEFINE(S_X0,			offsetof(struct pt_regs, regs[0]));

  DEFINE(S_X1,			offsetof(struct pt_regs, regs[1]));

  DEFINE(S_X2,			offsetof(struct pt_regs, regs[2]));

  DEFINE(S_X3,			offsetof(struct pt_regs, regs[3]));

  DEFINE(S_X4,			offsetof(struct pt_regs, regs[4]));

  DEFINE(S_X5,			offsetof(struct pt_regs, regs[5]));

  DEFINE(S_X6,			offsetof(struct pt_regs, regs[6]));

  DEFINE(S_X7,			offsetof(struct pt_regs, regs[7]));

  DEFINE(S_LR,			offsetof(struct pt_regs, regs[30]));

  DEFINE(S_SP,			offsetof(struct pt_regs, sp));

#ifdef CONFIG_COMPAT

  DEFINE(S_COMPAT_SP,		offsetof(struct pt_regs, compat_sp));

#endif

  DEFINE(S_PSTATE,		offsetof(struct pt_regs, pstate));

  DEFINE(S_PC,			offsetof(struct pt_regs, pc));

  DEFINE(S_ORIG_X0,		offsetof(struct pt_regs, orig_x0));

  DEFINE(S_SYSCALLNO,		offsetof(struct pt_regs, syscallno));

  DEFINE(S_FRAME_SIZE,		sizeof(struct pt_regs));

  BLANK();

  DEFINE(MM_CONTEXT_ID,		offsetof(struct mm_struct, context.id));

  BLANK();

  DEFINE(VMA_VM_MM,		offsetof(struct vm_area_struct, vm_mm));

  DEFINE(VMA_VM_FLAGS,		offsetof(struct vm_area_struct, vm_flags));

  BLANK();

  DEFINE(VM_EXEC,	       	VM_EXEC);

  BLANK();

  DEFINE(PAGE_SZ,	       	PAGE_SIZE);

  BLANK();

  DEFINE(CPU_INFO_SZ,		sizeof(struct cpu_info));

  DEFINE(CPU_INFO_SETUP,	offsetof(struct cpu_info, cpu_setup));

  BLANK();

  DEFINE(DMA_BIDIRECTIONAL,	DMA_BIDIRECTIONAL);

  DEFINE(DMA_TO_DEVICE,		DMA_TO_DEVICE);

  DEFINE(DMA_FROM_DEVICE,	DMA_FROM_DEVICE);

  BLANK();

  DEFINE(CLOCK_REALTIME,	CLOCK_REALTIME);

  DEFINE(CLOCK_MONOTONIC,	CLOCK_MONOTONIC);

  DEFINE(CLOCK_REALTIME_RES,	MONOTONIC_RES_NSEC);

  DEFINE(CLOCK_REALTIME_COARSE,	CLOCK_REALTIME_COARSE);

  DEFINE(CLOCK_MONOTONIC_COARSE,CLOCK_MONOTONIC_COARSE);

  DEFINE(CLOCK_COARSE_RES,	LOW_RES_NSEC);

  DEFINE(NSEC_PER_SEC,		NSEC_PER_SEC);

  BLANK();

  DEFINE(VDSO_CS_CYCLE_LAST,	offsetof(struct vdso_data, cs_cycle_last));

  DEFINE(VDSO_XTIME_CLK_SEC,	offsetof(struct vdso_data, xtime_clock_sec));

  DEFINE(VDSO_XTIME_CLK_NSEC,	offsetof(struct vdso_data, xtime_clock_nsec));

  DEFINE(VDSO_XTIME_CRS_SEC,	offsetof(struct vdso_data, xtime_coarse_sec));

  DEFINE(VDSO_XTIME_CRS_NSEC,	offsetof(struct vdso_data, xtime_coarse_nsec));

  DEFINE(VDSO_WTM_CLK_SEC,	offsetof(struct vdso_data, wtm_clock_sec));

  DEFINE(VDSO_WTM_CLK_NSEC,	offsetof(struct vdso_data, wtm_clock_nsec));

  DEFINE(VDSO_TB_SEQ_COUNT,	offsetof(struct vdso_data, tb_seq_count));

  DEFINE(VDSO_CS_MULT,		offsetof(struct vdso_data, cs_mult));

  DEFINE(VDSO_CS_SHIFT,		offsetof(struct vdso_data, cs_shift));

  DEFINE(VDSO_TZ_MINWEST,	offsetof(struct vdso_data, tz_minuteswest));

  DEFINE(VDSO_TZ_DSTTIME,	offsetof(struct vdso_data, tz_dsttime));

  DEFINE(VDSO_USE_SYSCALL,	offsetof(struct vdso_data, use_syscall));

  BLANK();

  DEFINE(TVAL_TV_SEC,		offsetof(struct timeval, tv_sec));

  DEFINE(TVAL_TV_USEC,		offsetof(struct timeval, tv_usec));

  DEFINE(TSPEC_TV_SEC,		offsetof(struct timespec, tv_sec));

  DEFINE(TSPEC_TV_NSEC,		offsetof(struct timespec, tv_nsec));

  BLANK();

  DEFINE(TZ_MINWEST,		offsetof(struct timezone, tz_minuteswest));

  DEFINE(TZ_DSTTIME,		offsetof(struct timezone, tz_dsttime));

  return 0;

}

arch/arm64/mm/proc-macros.S

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/*

 * Based on arch/arm/mm/proc-macros.S

 *

 * Copyright (C) 2012 ARM Ltd.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 as

 * published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */



#include <asm/asm-offsets.h>

#include <asm/thread_info.h>



/*

 * vma_vm_mm - get mm pointer from vma pointer (vma->vm_mm)

 */

	.macro	vma_vm_mm, rd, rn

	ldr	\rd, [\rn, #VMA_VM_MM]

	.endm



/*

 * mmid - get context id from mm pointer (mm->context.id)

 */

	.macro	mmid, rd, rn

	ldr	\rd, [\rn, #MM_CONTEXT_ID]

	.endm



/*

 * dcache_line_size - get the minimum D-cache line size from the CTR register.

 */

	.macro	dcache_line_size, reg, tmp

	mrs	\tmp, ctr_el0			// read CTR

	lsr	\tmp, \tmp, #16

	and	\tmp, \tmp, #0xf		// cache line size encoding

	mov	\reg, #4			// bytes per word

	lsl	\reg, \reg, \tmp		// actual cache line size

	.endm



/*

 * icache_line_size - get the minimum I-cache line size from the CTR register.

 */

	.macro	icache_line_size, reg, tmp

	mrs	\tmp, ctr_el0			// read CTR

	and	\tmp, \tmp, #0xf		// cache line size encoding

	mov	\reg, #4			// bytes per word

	lsl	\reg, \reg, \tmp		// actual cache line size

	.endm